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Reiterated genes with varying location in intercalary heterochromatin regions of Drosophila melanogaster polytene chromosomes

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Abstract

The localization of two cloned D. melanogaster DNA fragments in polytene chromosomes was determined by means of in situ hybridization. These different fragments (Dm 225 and Dm 234B) are present in the genome in hundreds copies and contain genes whose transcription yields two different classes in abundant mRNA (Ilyin et al., 1976, 1977; Tchurikov et al., 1978).

About 20–30 sites of these genes are demonstrable in the polytene chromosomes of a given stock. There are small but significant variations in the number and localization of these sites among individuals of the same stock. On the other hand, different stocks of D. melanogaster have an utterly different distribution of revealed hybridization sites in the polytene chromosomes. The location of both fragments (Dm 225 and Dm 234) was found to be virtually identical within any given stock of D. melanogaster. 69 sites for localization of Dm 225 or Dm 234 genes were detected in the chromosomes of 11 individuals studied. At least 50 (and up to 62) of them coincide with intercalary heterochromatin regions which are known to be characterized by ectopic pairing, late replication and the presence of “weak spots” in the chromosome.

The ability of Dm 225 and Dm 234 to code for the “abundant” classes of messenger RNA (Ilyin et al., 1976) and the fact that their location may coincide with the histone and ribosomal genes suggest that intercalary heterochromatin regions are “nests” containing various types of actively transcribable tandem-repeated genes coding for common “household” cell functions.

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Authors and Affiliations

  1. Institute of Molecular Genetics, USSR Academy of Sciences, Kurchatov Square, 46, 123182, Moscow, U.S.S.R.

    E. V. Ananiev & V. A. Gvozdev

  2. Institute of Molecular Biology, USSR Academy of Science, Vavilov street 32, 117312, Moscow, U.S.S.R.

    Yu. V. Ilyin, N. A. Tchurikov & G. P. Georgiev

Authors
  1. E. V. Ananiev
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  2. V. A. Gvozdev
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  3. Yu. V. Ilyin
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  4. N. A. Tchurikov
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  5. G. P. Georgiev
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Ananiev, E.V., Gvozdev, V.A., Ilyin, Y.V. et al. Reiterated genes with varying location in intercalary heterochromatin regions of Drosophila melanogaster polytene chromosomes. Chromosoma 70, 1–17 (1978). https://doi.org/10.1007/BF00292211

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  • DOI: https://doi.org/10.1007/BF00292211

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